Strainer or filtering device for water and other liquids



Nov; 4 1924. I 1,513.878 H. C. ANTHONY STRAINER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS Filed Dec. 23. 1920 7 Sheet-Sheet 1 Nov. 4', 1924. 1,513,878

H. c. ANTHONY STRAINER OR FILTERING DEVICE FOR WATER AND OTHER'LIQUIDS Filed Dec. 23. 1920 7 Sheets-Sheet P.

H. C. ANTHONY STRAI NER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS Nov. 4

7 Sheets-Sheet 5 Filed Dec.

Nov. 4 1924.

H. C. ANTHONY STRAINER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS I 7 Sheets-Sheet 4 Filed Dec. 23; L920 4: 7 1-924 H. C. ANTHONY STRA-INER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS Filed Dec. 23. 1920 '7 sheets-sheet 5 F/GJI.

Nov. 4 1924. 1,513.878

H. c. ANTHONY STRAINER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS Filed Dec. 23. 1920 '7 Sheets-Shet e F/GJZ. v new.

4/ gal;

v H. :.v ANTHONY STRAINER OR FILTERING DEVICE FOR WATER AND OTHER LIQUIDS Filed Dec. 23; 192d 7 Sheets- Sheet 7" Han/8.

gggiiaii Patented Nov; 4, 1924.

UNITED STATES PATENT OFFICE.

HERBERT CHARLES ANTHONY, or Nnwcas'rLE-UroN-rYNE, ENGLAND.

STRAINEB OK FILTERING DEVICE FOR WATER, AND OTHEB LIQUIDS.

Application filed December 23, 1920. Serial No. 432,774.

mond', N ewcastle-upon-Tyne, Northumber-- land, England, have invented certain new and useful Improvements'in and Relating to Strainers or Filtering Devices for Water and Other Liquids, of which the following is a specification. I This invention comprises improvements in and relating to strainers or filtering devices for water and other liquids, but chief- 1y [applicable for the straining of river) water, sewage and other water bearing waste matters, refuse and other objectionable bodies.

More particularly this invention. relates to that type of strainer in which a' revolving or moving screen traverses all the stream of water entering the draw-'ofi or suction pipe.

The invention principally provides .improved means for enabling the working 2 parts proper to be brouht above the surface of the water or or enabling such arts to. be adjusted relatively to the surace of the water, and improved means for making a seal between the fixed and moving parts of the strainer against the pas- 'sage of objectionable bodies to the pipe through which the screened water passes,

the improvements allowing the .working parts of such seal to be brought above the surface of'the water.

Heretofore strainers of this nature have been proposed in which the strainer took the form of a cylindrical cage centrally and revolubly mounted on the draw-off pipe. 40 It has also been proposed in connection with strainers of the endless band variety to place the strainer proper in the sides or entry to a permanent underwater chamber, into .which the screened water alone' could pass,

. and in the sides of which the draw-off pipe has been arranged so that it could withdraw the screened water from the interior. One object of the present invention, as

- applied to those strainers adapted completely in themselves to enclose the entry to the suction pipe, is so to mount the strainer in relation to the draw-off or suction pipe that the depth of immersion of the strainer may be varied as required while in operation, or

alternatively it may be arranged to be immersed in the .Water'at a constant but adustable depth relative to the surface of the water.

Another important object of this invention is so to construct strainers'of the type referred to that the sealing surfaces may be kept in close rubbing contact at all parts of the pathway along which the screen travels.

According to this invention, the strainer that encloses the entry tothe draw-0d pipe 1s mounted eccentrically on the draw-off pipe, which together with the strainer is arranged to revolve about an axis,'so as to vary the depth of immersion of the pi pe-end and strainer as required.

The screening device may have combined therewith floating means so that it may remain immersed at a constant depth relative to the surface level of the water when the latter rises and falls with respect to the shore level.

The eccentric mounting of the screen enables the bearings of the strainer to be placed just above the water level so as to be readily accessible for adjustment and repair, while keeping the downwardly depending length of suction pipewithin the strainer as short as possible consistent with effective sealing of the inlet against ingress of air, also,'so that just so much of the screen area may rise above the surface of the water as will permit of effective oleaningj Moreover, by thismeans, the screen may be kept as small as possible for any given set of confixed and floating types of rotary drum l strainer and the fixed and floating types of endless band strainer. In the drum type, the eccentric mounting allows the drum to be kept as small as possiblewhile securing the desired immersion of the suction pipe and the necessary exposed portion of the strainer abovc' high water level. In the endless band type, the eccentric mounting allows the foregoing ends to be attained as well as allows screens of this type to be revolved so as to bring the underwaterpart to the surfaoe of the Water without unshift- 'ing the suction pipe. In. the case of the endless band type of screen being of elongated form, the mounting ofthe screen on the draw-elf pipe in an eccentric manner is intended to mean thatjthe pipe emerges from the side of the screen at a suitable point nearer to one end of the screen than the other.

The connection of therevoluble draw-off or suction pipe with the pipe or pipes leadingto the shore may be effected by means of any suitable type of swivel joint, which will prevent ingress of air. The preferred form,- however, ;for use in cases where the tension on the joint is not great, "comprises an annular water chamber or channel between the parts through which a stream of water is kept circulating. The joint is madehydraulically tight by suitable packing and any air entering the joint will be carried away by the circulating water. This form of joint, of course, is equally applicable, whether the strainer be of the drum type or of the endless band type.

Improved forms of screening band are preferably employed according to the invention, that for the rotary drum type consisting of annular screening plates arranged on the sides of the drum, while in the endless band type, for the purpose of eliminating the usual chain link, bearing roller am plate construction, and obtaining a better seal, the perforated screen plates are knuckled at the ends in the manner of a hinge and the knuckles are adapted to pivot with slight angular movement upon transverse bars carrying the rollers, suitable wearing liners being provided for the lmuckles. Special one hole links are fitted over the roller bars at the side of the plate to form a seal between the plates and the sides of the screen, as will be more fully described hereinafter.

In order to enable the invention to be readily understood, reference is directed to the accompanying drawings, in which: Figure 1 shows in side elevation one suitable form of rotary drum strainer of the fixed type, constructed according to this invention, and

Figure 2 is a central sectional view of the strainer taken at right angles to Figure 1'.

Figure 3 is a sectional view illustrative of the construction of the swivel joints for the draw-ofi' pipe or suction pipe.

Figure 4 shows a modified form of rotary drum strainer of'the fixed type, and

Figure 5 is a central section taken at ri ht angles to Figure 4.

igure 6 isa more or less diagrammatic elevation of another modified form of rotary drum strainer of the fixed type, and

Figure 7 illustrates a central section thereof taken at right angles to FigureG. Figure 8 "indicates "in 'side elevation a suitable form of rotary drum strainer of the floating type.

Figure 9 shows a suitable form of endless band strainer of the fixed type, in side elevation.

Figure 10 is an end view, and

Fi re 11 is a sectional plan view on the line "I--XI Figure 10.

Fi re 12 is a more or less diagrammatic end e evation vof a modified form of endless band strainer of the fixed type, and

Figure 13 is a side elevation.

Figure 14 is an end elevation of a convenient form of endless band strainer of the floating type, and

Figure 15 is a side elevation of Figure 14.

Figure 16 is a part section and part side elevation, to an enlarged scale, of the upper part of the screen shown in Figures 9 to 15, and illustrating the improved form of endless band arrangement,

Figure 17 is a sectional plan of such screen. L p

Figure-18 is a view on a larger scale of part of the improved form of endless band arrangement.

Figure 19 is a section of Figure 18, omitting the sealing links,

igure= 20 is a view illustrating the construction of the sealing links, and

Figure 21 is a detail sectional view of the stra ner band seen in Figures 16 to 20, the sectlon being taken through the straight stretch of band, say along the line XXI-XXI of Figure 9, but the scale being the same as in Figures 18 to 20. i

The form of filter device shown in Figures 1 and 2, comprises a rotary drum strainer or screen of the fixed type as distingulshed from the floating type.

The strainer comprises a cylindrical drum 0. havmg a series of filter plates which together form annular screening plates 1) on the sides of the drum. The periphery of the drum preferably is imperforate, but alternatively the strainer may have peripherally mounted filter plates only, these filter plates being arranged to incline from the centre plane of the drum outwardly to both sides of the drum. Either arrangement of filter plates gives a larger area for filtering purposes and a vertical or inclined surface to render easier the removalof adherent matter. 'A draw-off pipe d passes from the screen at either side at a point eccentric of the screen,

through a swivel joint e, the two draw-off PIPGS bemg united within the screen in a single, or as shown, a double depending suction pipe The construction of the swivel oints e Wlll. be fully described hereinafter.

with reference to Figure 3. .The draw-ofi p1pes d, after'they emerge from the swivel joints 0, have a right-angle bend towards the shore, and at the swivel joints they are supported in brackets h mounted on a suitable staging k. The screen a is suitably rovided with side plates 1, which are fixe on orformed in one with the swivelling suction pipe f, and the latter is revolubly mounted in bearings in the brackets h. The annular screening plates 1) aforesaid are secured on their inner peripheries to troughs m which arerevoluble on the outer flanges of the'side plates Z, suitable bearings 01, with li um vitae blocks or other bearing surfaces, eing provided between the parts. The troughs m serve as dirt troughs for matter removed from the screenings rings by the spray pipes 0, and hoods 0' are suitably fitted opposite the spray pipes to direct such matter into the troughs. One of the troughs is rovided with'a circular rack 11 for enab ing' the screening rings 6 to be rotated, during the operation of the apparatus, as will be hereinafter described.

Any suitable means may be employed for giving concentric motion to the annular screening plates 6, on the drum, and eccentric motion to the drum with whichmoves the swivelling suction pipe 7. The eccentric motion could, for example, be effected from the upper part k of the staging k by means of a suitable block and tackle gear, or, as shown, by a hoisting cable J0 and winch k The cable is fastened at one end, as at It, to a side plate Z of the drum, passing thence over pulley, rollers or studs k on the side plate of the winch k. The concentric motion could be efiected throu h a vertical shaft p having a driving w eel p at the upper end and a worm or worm wheel '1) at the lower end gearing with the rack p aforesaid. The shaft p is supported at the upper end in a suitable bearing p on the staging 7c and at the lower end in a bearin bracket p secured to the appropriate si e plate I and upon applying motion to the driving, wheel 1), say from a motor on shore, the worm or worm wheel p operates the rack 12 and thus effects the .desired revolution of the screening rings 1) on the side plates Z. Upon engaging the worm or worm wheel 17* f m the rack 12 and shaft 2 from the bracket p in any convenient manner, the drum a may be swivelled up eccentrically by means of the block T and tackle gear aforesaid until the suction w erein fragmentary I a joining ends of the pipe 7 is above water or in any other desired position and any convenient means ma be provided for holding the drum in suc' position, as will be evident.

The axis of rotation may, if desired, and as shown, be above low water level, in order to facilitate adjustment and repairs. The high and low water levels are indicated by the initial letters H. W. L. and L. W. L. re-

spectively in Figure 1.

joints 6 aforesaid, is shown in Figure 3, portions only of the xed draw-off piped and the swivelling suction pipe 7 are shown,

the end of the pipe I being enlarged to re-.

ceive the joint members. A liner cl is shrunk on the end. of the pipe (1, being secured by a ring (1 attached to the pipe d by screws as shown, and a recessed air-tight fitting liner f is provided within the enlarged end of the pipe f. A channeled ring f is arranged between the liners d and f, and forms an annular water channel between the two pipe ends, to which an inlet and an outlet water pipe are connected, a radial baflle being provided in the an nular water channel between the waterinlet and outlet connections so as to ensurethe required flow of the water. On each side of the ring f hemp or hydraulic packing f and annular cup washers f are provided the whole bein held in posltion by the, gland ring 7. ome of the water to the spray pipes o aforesaid or from any other suitable source, is bye-passed or passed through the annular channel formed by the ring f and any air that gets past the outer leather washers f and packing i and enters the annular water chamber is immediately led.

away by the water circulating through the channel to the spray pipe aforesaid.-

It will be observed from Figures 1 and 2, that while filtering, the worm or worm wheel 29 can only gear with and operate the rack p if the drum a is immersed to the fullest extent. It will be apparent howrotate the annular plates b-in all positions of the drum, will be seen in Figures 4: and 5 together with modified means for eccentrically swivelling the drum. These arrangements, 'of course, are onlygiven by way of example 'and the driving ofthe annular screening plates 1), and the swivelling of the drum may be effected-in any'appro being of known type are only shown more or less diagrammatically, while the side plates 1 of the drum are separate from the swivelling suction pipe f and are mounted thereon at. the sealing joint 9'. The driving means for giving concentric motion to the annular screening plates 6 may comprise a shaft g mounted on one of the drawof! pipes d and driven for instance. from a motor (not shown) on the shore. The shaft g transmits its drive through a bevel gear 1' thereon to a bevel gear 8 revolubly mounted in any convenient manner upon the swivelling suction pipe 7 (see .Figure 5). The bevel gear .9 in turn drives another seen bevel gear t on a shaft u mounted radially of the drum a in brackets c on one side of the drum. The shaft u carries a pinion w meshing with the rack p, which upon being rotated, causes the aforesaid motion of the screening plates 6. The eccentric movement of the screen a may be effected, for example by means of bevel gears av driven by a handle 3 or by power, and transmitting their motion through a shaft 2 and a pinion 1 to a circular rack 1 mounted upon the other side of the screen concentrically to the draw-ofl? pipe. The gears :22 and the shaft 2 are suitably mounted upon a bracket I or' standard 2-on the upper part of the staging 7c and the handle 3 or its shaft may be suitably-secured in whatever position it may be adjusted to. The cylindrical screen a will thus be able to be rotated about its eccentric axis and secured by suitable means in any desired position, until the required submergence of the screen and the end of the suction pipe is obtained. The axisof roe tation may as before, be above low water level, in order to facilitate adjustment and repairs.

Figures 6 and 7 are illustrative of a suitable modification of the type of strainer shown in Figures 1 and 2 or 4 and 5. In this case, there is only one draw-oflz' pipe d, with swivelling suction pipe f, passing through one side of the screen a, as will be rom Figure 7, and where the pipe f bends so as to depend downwardly within the screen, it is rovided or formed. with a. bracket or the ike 3 for supporting the other side of the screen a. The end of the bracket 3 is fashioned to provide a journal 4, which turns in a bracket 5 on the stagin k, the swivelling pipe f being supporzed by the bracket 5 an by another bracke 6 on the staging Ia. H

The modified form of rotary drum strainer shown'in Figure 8 is of the floating type. A float chamber 8 may be secured within the cylinder screen a, such float chamber suitably comprising a thin metal watertight chamber secured over the suction pipe f. The draw-'ofl pipes d in this case isu'e from the sides of the screen and turn at right angles to a staging 9 on the shore, where'they are su ported by brackets 10. The ipesare fitte with swiveljoints to allow t e screen wand draw-ofi' pipes d to swing or ivot, thus enabling the screen to rise andfe'; l with the varying water level.

The full lines indicate the position of the screen at low water level (L..'W. L.) and levels of .the chain 'lines the position of which mi ht be assumed at high water level '(H. W. The water levels shown correspond to the .ring tides, the floating type of strainer ing particularly advantageous where there is an a preciable rise of tide. The driving means or eccentrically moving the drum a and revolving the annular screening plates. b may be on lines-similar to those shown in Figures i and 5, though both motions would be effected through shafts supported on the draw-off pipes, as will be readily understood. j,

The invention may also be applied to strainers of theendless band type, 1n which a series of filter lates supported upon andbetween endless c ains or in any other con.- venient manner, travel around the rimsters of'side plates or frames. Suita le ar rangements of this type will now bedescribed with reference to Figures 9 to. 15, those shown in Figures 9 to 13 bein of the fixed type and that shown in' igures 14 and'15 being ofi the floating type.

In Figures 9, 10 and 11, the side plates Z" are ofelongated shape, thou h circular side plates may be employed, an the draw I 011' 1pes'd ass thro h the side plates on eith r side Bf the sci' e en 0: at the desired eccentricity. Swivel joints g or joints of the form shown in Figure 3, are-provided near the point of egress of the draw-oil pipes from the screen so that the latter may be 1 t about. by a shaft 42 mounted onthe shaft carrying a bevel gear 43 driving a bevel rack 44 fixed on one of the side plates Zggor on the suction f.

The endless, band 11 ofv ter plates may be caused to travel around'the side frames l by means of any convenient driving mech- 2 anism, for instance, the bandmay be carried by sprocket of gear wheels 12, arranged on transverse shafts 13 mounted in the side lates Z, and the upper ear wheels may be driven by means ofa vel gear 14. on

the corresponding sprocket shaft 13. 'The' gear 14' meshes with another bevel gear 15 'on a shaft 16 suitably mounted in brackets 16 Ion one of the side plates Z, and the lower end of the shaft 16 carries a bevelcar 17 meshing with abevel gear 18 revoubly mounted on the swivelling part 7 of the draw-ofi pipes. The bevel gear 18 may be arisen by another bevel gear 19 fixed on a shaft 20 which is mounted on one of the draw-off leading t6 the shore and from there is 'ven by means of a motor.

Figures 12 and 13 illustrate diagrammatically a form of filter. device similar to thatshown in Figures 9 to 11, exceptin {hat a sin le drag-01f pipe d (pith swive ing part is use enterin an sup rting thescreen at one side amfprovided iit' the place where it bends downwardly in the screen with a bracket or the like 21,which supports the screen at the other side and is formed as a journal 22 for the screen. The arrangement of the suction pipe 7 with bracket 21 is the same as that shown in Figures 6 and 7 and therefore will need no in Figures 14 and 15, from which it will be observed that the strainer a is supported from the shore by means of a parallel link system with its longer axis approximately vertical. The upper members of the link system are comprlsed by the swinging drawofiI' pipes d and the lower members by suitable connecting arms 23, pivotally attached tothe lower rtions of the side frames of the screen, an to the staging in on the shore. A suitable float chamber or chambers is or are provided, Figure 14 showing two float chambers 24, supported one on each side of the lower portion of the screen. By altering the disposition of the connecting arms 23 in relation to the shore in any convenient manner, the extent and angle of immersion may be adjusted as desired, while the filter device a will rise and fall with the varying water level at a constant angle to the vertical, as will be understood.

The. improved form of endless band arrangement preferred for use with the constructions shown in Figures 9 to 15, is illustrated in Figures 16 to 21. The endless band comprises a number of perforated filter plates 25 so formed at each end as'to provide knuckles 26, the interfitting knuckles of adjoining plates being jointed together to allow of the slight angular movement of the plates with respect to each other, by'means of bars 27 carrying rollers 28 at their ends, see particularly Figures 18, 19 and 21. The bars 27 are suitably fitted with wearing liners 27 for the knuckles of the screen plates. Through the medium ofthe roller bars 27 and rollers 28,

the filter plates are carried by the gear wheels or sprockets 12, the upper one only of which is shown m Figure 16. -The sprockets have approximately semi-circular recesses-29 for receiving and engaging-the rollers 28 andthe band is adapted to be held in place by the engagement of the rollers with inner and outer angle irons 30, 30 fixed around the perimeters of the side plates Z as will be understood from. Figtween the screen plates 25 and the side plates Z, sealing links 31 are'employed of the form shown in Figure 20 and these links, as will be seen from Figures 18 and 21 form aseal between the filter plates 25 and the edge of the angle irons 30. It will be noticed that these sealing links'have a pivot hole at one end only for fitting over the roller bars 27, the other end being. fashioned to pivot upon or with respect to the perforated end of the next link. The hinge joints between the filter plates may be fitted with loose fitting covers 32 as shown in Figures 18 and 19. To provide for stretching or adjustment of the endless filter band, the screen is suitably provided with a separate head portion a seen in Figures 9, 13, 15 and 16, and as will be clearly seen from Figures 16 and 17, this head portion is adjust-ably secured to the lower body portion of the .screen by means of channel-bars 33 adapted to fit and slide between parallel angle irons 35 secured to the lower body portion ofthe screen. The adjustment of the head-portion a to stretch or loosen the endless filter band 11 is effected by means of screws 36, each of which is revolubly mounted on a base '37 on the lower body portion of the screen and engages a nut member 38 formed on the plates or .bars 33. Alternatively, the sprocket bearings alone may be mounted in slideways and be adjustable by means of a screw. The bevel gear 15 aforesaid is slidably feathered on its shaft 16 so as to allow the adjustment of the head portion of the screen while maintaining engagement with the bevel gear 14.

Obviously, anysuitable form of endless filter band may be employed, as will be readily understood, but the improved form above described is advantageous, as it dispenses with the usual chain link, roller and plate constructionand effectively seals the filter plates when travelling round the sprockets. i

As shown in elevation in Figures 9 and 10, and in section in Figure 21, the end-' less band type of filter may be provided with a rough screen 39 as a projection for the filter band 11. Also a trough or the like 40, with a shield or hood 41, may be ures 16 to 18 and 21, the inner angle irons draw-01f pipe to vary the depth of immer- 30' being discontinued where the sprocket wheels engage the rollrs28 Figure sion of the screen.

2- A s a ner tor-we ra o h r q s comprising a filter screen, a draw-ofi pipe having a revoluble end part pro ecting into the screen and upon which the screen is screen.

4. A strainer for Water and other liquids, comprising a filter screen, a draw-oil pipe having its open end enclosed by the screen and-the latter ececntrically mounted thereon,

and bearingsvfor said screen arranged above the water level and permitting the screen to be revolved eccentrically about the axis of the draw-oil pipe to vary the depth of immersion of the screen.

5. A stramer for water and other liquids,

comprising a filter screen, a'draw-oflf pipe having a revoluble end part projecting into the screen, and upon which. the screen 'is eccentrically mounted, and bearings for said end part of the draw-oil pipe, said bearingsbeing above the water level and permittimq'- adjustment of said end part of the draw-off pipe so as to vary the depth of immersion of the pipe end and screen.

6. A strainer for water and other liquids, comprising a screen having an endless filter band formed. of screen plates hingedly jointed together, a draw-oil pipe having its.

open end enclosed by the screen and the latter eccentrically mounted thereon and means permitting the screen to be revolved eccentrically about the axis of the draw-off pipe to vary the depth of immersion of the screen.

' a suction pipe for drawing ofi'water from 7. A strainer for water and other liquids, comprising side members, a band of screen plates arranged around the perimeter of said side members, pivot bars for hingedly connecting said plates together, rollers on said ivot bars, tracks for said rollers on said side members, sprockets adapted to engage said rollers, a supported in said side members, means tor drivmg saidsprockets,

thespace within-said band, and an eccentric mountmg'ror said side members permitting same to swivel on an eccentric axis, substantially as set forth. I 1 8. A strainer for water and other liquids,

comprisin su porting members, an endless, travelling an of hingedly connected, screen plates arranged upon supporting members, series of horizontal pivotal links forming a sealbetween the edges of the band and said sup-porting members, drivin means for said band, and a suction pipe or drawing off water from the space within the band.

9. A strainer for water and other liquids, comprising supporting members, an endless travelling band of screen piates, arranged upon said supporting mem rs, pivot bars hingedly connecting said plates, links pivoted upon said bars at the edges of the band for forming a seal between said edges and said supporting members, driving means for said band, and .a suction pipe for drawing oil water from'the space within the band.

10. A strainer for water and other liquids, comprising supporting members, an endless travelling band or screen lates, arranged upon said supporting mem rs, pivot bars hingedly connecting said plates, links for forming a seal between the edges of said band and said supporting members, said links each being ivoted at one end on one or other of said plvot bars, and at the other end having pivotal engagement with the end of an adjominglink, driving means for said band, and-a suction pi for drawin oil water from the space w1thin the ban I i 11. A strainer for water and other liquids, comprising side plates, an endless travelling band of screen plates arranged around the perimeter of said side plates, pivot bars for hingedly connecting said screen plates together, links for forming a seal between the edges of said band and said side plates, said llIlkS each being ivoted at one end on one or other of sai pivot bars and at the other end havin with the end of an means for said band, a suction pipe having its open end enclosed by said side plates and band, and' an eccentric mountin for said side plates permitting adjustment t; ereof. on an eccentric axis, substantially as set pivotal on merit forth.

12. A strainer for'water and other liquids comprising side plates, an endless travelling band of screen plates arranged around the perimeter of said side plates, pivot bars ingedly connecting said screen plates together, rollers uponsaid pivot bars, tracks for. said rollers arranged upon the perimeter of said side plates, series of ivotallinks carried by said pivot bars an forming a seal between the edges of said band and said side plates, sprockets adapted to en said rollers, driving means for said sp ets, suction pi having its open end encl by said si 0 plates and said band, and an. eccentric mountinge or said side plates permitting same to revolved about an cecentric axis, substantially as set forth.

comprising a filter screen, a draw-0E ipe leading from the screen, and a'swivel oint aid'oining-link, 'iving. i

osed 13. Astrainer for water and other liquids,

in the draw-ofl' pipe, said swivel joint comprising an annular chamber through which water is circulated for the purpose described.

14. A strainer for water and other liquids, comprising a filter screen, a draw-off pipe havmg a revoluble end part projecting into the screen and upon which the screen is mounted, and a swivel joint between the revoluble and stationary parts of said pi comprising an annular chamber throng which water is circulated for the purpose described.

HERB

ERT CHARLES ANTHONY. 

